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THE  INSECTIVOROUS  OTTER                       513

L. m&rgulus, is about the size of Jhis rallies; it has webbed
toes and a powerful laterally-compressed tail. Clavicles are
present, which is not the case with Pota?t\ogal*\
G'ryzoTyctes is a Mole-like Centetid. It has ibssorial fore-
limbs, but a fairly long tail. This genus is furry like the last
two. It is said to burrow in the rice-fields and to do much
harm. The teeth are forty in number, three incisors and three
molars in each half of each jaw.
Fam. 4. PotamogaHdae.—This family contains two genera,
Putastnogale and Gfeoflale.
Potci'mogalc velox is a West African animal, which though an
Insectivore has the habits of an Otter. It is ie somewhat larger
than a stoat." The upper surface of the body is dark brown,
the belly brownish yellow. It has a flat head and a long tail
like the Stoat, but the tail is laterally compressed and very
thick. The eyes are very small; the nostril has valves. The
toes are not webbed ; but the second and third toes are united for
the whole length of their first phalanges. Along the outer side
of the foot is a thin extension of the integument. In swimming
the feet are drawn up along the body, hence webbing would be
of 110 use ; but the thin flattening prevents the edge of the foot
from acting as a hindrance to the motion of the animal.
M. do. Chaillu describes it as catching fish, which it pursues
with extreme rapidity in the clear mountain streams it
frequents; but Dr. Dobson, remarking that no stomachs have
been examined, thinks that water insects are more probably its
prey. It is not known whether the animal possesses a caecum.
The tooth formula * is I -f C -J- Pm f- M -f. The animal is excep-
tional among the Iiisectivora in having no clavicles.2 There are
sixteen ribs; there is no zygomatic arch, and the pterygoids
converge posteriorly.
Geogale, with one species, Gr. auritaf is a small representative of
this family from Madagascar. It has only thirty-four teeth. When
better known it may be necessary, thinks Mr, Lydekker, to make
this animal the type of a separate family. The tibia and fibula
are distinct, not confluent with one another as in. Potatnogcde.
Fam, 5. Solenodontidae.—This family contains but a single
genus,
1 Allman states the canines to be absent.     I follow Mower and Lydekker.
2 See Allnuui in Trans. &ool. Soc, vl. 1S69, p. I.
VOL. X                                                                                          2  I*